Running Software (issues missing this information will be deleted):

• Addon version: 10.4.1
• Server patch: Build 3.4.2.50664

Have you read the changelog? (please don't waste our time)
Yes

Describe the bug
Shift clicking a stack of items (5 items in this specific instance) resulted in the error below.

To Reproduce
Steps to reproduce the behaviour:

1. Go to guild bank
2. Shift-Click on on a stack to try to get just 1 item from the stack
3. See Error

Expected behaviour
I expected it to bring up the box to select how many items I wanted off the stack.

Screenshots
If applicable, add screenshots to help explain your problem.

Error Logs
Type /console scriptErrors 1 in the chat and reload the game. If an error window appears, write here the message with ID: 1 (labelled 1/X). This is generally NOT the message that the window shows by default.

Message: Interface/AddOns/BagBrother/frames/guild/item.lua:30: attempt to compare number with nil
Time: Sun Aug 13 11:21:57 2023
Count: 1
Stack: Interface/AddOns/BagBrother/frames/guild/item.lua:30: attempt to compare number with nil
[string "@Interface/AddOns/BagBrother/frames/guild/item.lua"]:30: in function <Interface/AddOns/BagBrother/frames/guild/item.lua:26>

Locals: self = BagnonGuildItem31 {
timeSinceUpgradeCheck = 0
OnEnter = defined @Interface/AddOns/BagBrother/core/classes/item.lua:118
__super =

{
}
UnregisterAll = defined @Interface/AddOns/BagBrother/core/classes/base.lua:27
IconOverlay = Texture {
}
Super = defined @Interface/AddOns/BagBrother/libs/Poncho-2.0/Poncho-2.0.lua:157
Bind = defined @Interface/AddOns/BagBrother/core/classes/item.lua:91
IconBorder = Texture {
}
flashAnim = AnimationGroup {
}
OnReceiveDrag = defined @Interface/AddOns/BagBrother/frames/guild/item.lua:59
icon = BagnonGuildItem31IconTexture {
}
Backgrounds = {
}
UpdateTooltip = defined @Interface/AddOns/BagBrother/core/classes/item.lua:118
ExtendedOverlay = Texture {
}
__type = "Button"
__count = 31
GetFrameID = defined @Interface/AddOns/BagBrother/core/classes/parented.lua:35
NewItemTexture = Texture {
}
Delay = defined @Interface/AddOns/BagBrother/libs/MutexDelay-1.0/MutexDelay-1.0.lua:27
SplitStack = defined @Interface/AddOns/BagBrother/frames/guild/item.lua:75
BagStaticBottom = Texture {
}
UpdateLocked = defined @Interface/AddOns/BagBrother/core/classes/item.lua:182
UnregisterMessage = defined @Interface/AddOns/BagBrother/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:153
Update = defined @Interface/AddOns/BagBrother/core/classes/item.lua:141
flash = Texture {
}
Dummy = Button {
}
RegisterFrameSignal = defined @Interface/AddOns/BagBrother/core/classes/base.lua:15
SetDesaturated = defined @Interface/AddOns/BagBrother/core/classes/item.lua:187
UpdateSearch = defined @Interface/AddOns/BagBrother/core/classes/item.lua:215
hasItem = true
UnregisterSignal = defined @Interface/AddOns/BagBrother/libs/WildAddon-1.0/WildAddon-1.0.lua:78
count = 5
GetProfile = defined @Interface/AddOns/BagBrother/core/classes/parented.lua:19
info = {
}
GetQuery = defined @Interface/AddOns/BagBrother/core/classes/item.lua:305
OnDragStart = defined @Interface/AddOns/BagBrother/frames/guild/item.lua:53
frame = BagnonGuild1 {
}
Delaying = defined @Interface/AddOns/BagBrother/libs/MutexDelay-1.0/MutexDelay-1.0.lua:46
Count = BagnonGuildItem31Count {
}
UnregisterAllEvents = defined =[C]:-1
IconGlow = Texture {
}
searchOverlay = BagnonGuildItem31SearchOverlay {
}
Construct = defined @Interface/AddOns/BagBrother/frames/guild/item.lua:13
BagFamilies = {
}
SendSignal = defined @Interface/AddOns/BagBrother/libs/WildAddon-1.0/WildAddon-1.0.lua:82
bag = 1
BattlepayItemTexture = Texture {
}
GetOwner = defined @Interface/AddOns/BagBrother/core/classes/parented.lua:27
JunkIcon = Texture {
}
GetTipAnchor = defined @Interface/AddOns/BagBrother/core/classes/tipped.lua:19
__template = "ContainerFrameItemButtonTemplate"
Flash = AnimationGroup {
}
UnregisterEvent = defined =[C]:-1
GetClassName = defined @Interface/AddOns/BagBrother/libs/Poncho-2.0/Poncho-2.0.lua:100
GetClass = defined @Interface/AddOns/BagBrother/libs/Poncho-2.0/Poncho-2.0.lua:135
ShowTooltip = defined @Interface/AddOns/BagBrother/frames/guild/item.lua:68
newitemglowAnim = AnimationGroup {
}
IsAbstract = defined @Interface/AddOns/BagBrother/libs/Poncho-2.0/Poncho-2.0.lua:116
UpdateUpgradeIcon = defined @Interface/AddOns/BagBrother/core/classes/item.lua:223
New =

Additional context
Add any other context about the problem here.

I have the issue open on the BagBrother github here: Jaliborc/BagBrother#24

Fix for this can be found in the comment section of the mentioned issue.